Rudolf wittmann



(No Model.)

R. WITTMANN.

DIMENSION MEASURE.

No. 258,788. Patented Apr.18,1882.

INVBNTOR I WMM BY Y d@ ATTORNEYS.

` UNITED STATES PATENT Orifice RUDOLF VITTMANN, OF NEW YORK, N. Y.

DIMENSION-MEASURE.

SPECIFICATION forming part of Letters Patent No. 256,783, dated April18, 1882.

I Application lcd July 22,1881. (No model.)

To all 'whom it may concern Be it known that I, RUDOLF WrrTMANN, of thecity, county, and State of New York, have invented a new and ImprovedInstrument for Measuring Dimensions, of which the following is aspecification,

The object of my invention is to provide a new and improved device formeasuring dmensions--such as curved and right linesrapidly andaccurately.

In the accompanying drawings, Figure 1 is a front view ot' my improvedmeasuring de vice. Fig. 2 is a cross-sectional elevation of the circularcasing of the same. Fig. 3 is a longitudinal sectional elevation ot' thelower end ofthe shank ofthe same. Fig. 4 isaplan view of the under sideof the receptacle for my improved measuring device, showing thereceptacle opened.`

Similar letters of reference indicate corresponding parts.

The dividers A are provided with the ordinary pivoted shanks, B B, andwith an additional pivoted shank, O, provided at its lower recessed endwith a screw-sleeve, D, for-holding' a pencilpoint, E. A circularcasing, F, is attached to the joint-piece G of the dividers, and thiscasingvF contains a dial, H, the diameter of which is equal to one inchand the circumference ot' which is subdivided into twelve, twenty-four,forty-eight, or any other number of parts. The diameter of this dial canbe greater or less than one inch, but l have taken a diameter of oneinch as an example. This dial EI is attached to a cogwheel, J, whichwheel engages with a cogwheel, K, of the same size and number of teeth,which in turn engages with acog'wheel,

L, of the same size and number of teeth, and pivotcd to a projection, M,ot' the casing F. One revolution ot' the wheel L will thus correspond toone revolution of the wheels J and K and the dial H. The projection M isprovided with a rigid pointer, N, extending almost to the periphery ot'the cog-wheel L. A cog-wheel, O, having one tooth ,more or less than thewheel J, also engageswith the cogwheel K, and is provided with apointer, I), passed through the center of the dial H and revolving overthe face of the same. rEhe casing F is also provided with arigidpointer, Q,

extending from the middle of the dial to the edge ofthe same; or thispointer can project from the side of the easing a short distance overthe dial. Thelower ends, R, of the shanks B B are screw-threaded, andare provided with a longitudinal groove, S, increasing in depthtoward'the end ot' the shank to receive the' Ater-scale, Y. The casing Fis provided with a glass cover, Z.

The operation is as follows The shanks B B are used to measure shortlines, &c.,in the ordinary manner, and the shank C is used to drawcircles. To measure a curved or right line the instrumentis inverted sothat the wheel Lrests ion ot' the dial back of that point of the dialvto which the pointer P pointed at the beginning of the operation. L, J,and K have twenty-three teeth and the pointer P stood at O at thebeginning of the operation and the wheel L has made one revolution, thepointer P will point to 23 after the completion of 'this revolution, andthus the pointer P will always show the number of z evolutions made bythe wheel L-that i's,in this case the length of the measured line ininchesthe fractions ot'inches beingshownhythepointer Q. As the grooves Siu the lower ends ofthe shanks B are inclined to the length of theseShanks, the needle .l will be flrmly wedged in between the bottom ofthe'grooves and the screw-sleeves U, and can be fastened or loosenedvery easily. rI'he pointer l? has been described as revolving from rightto left, but can be revolved from left to right if the wheel O has onetooth less than the wheel J, instead of roo.

one more.

IIavln g thus fully described my invention, I

For instance, if the wheels elam as neu7 and desire to secure by LettersPatentl. A lneusuring-instruinentA having on the piece G it easing, F,provided with the dial H, the pointer Q, and the oog-Wheel J, the cog-Wheel K, the oog-Wheel L, journaled in a pointer carrying outsideprojection, M, and an inside Wheel, O, having' one cog less than WheelJ, and carrying a pointer, P, as shown and deio scribed.

2. In u measuring-instruinent, the shunks B, screw-threaded at the lowerends and provided with the tapering longitudinal groove S, inColnbinatiou with the needle T and screw-sleeve U, as and for thepurpose specified.

4RUDOLF VITTMANN.

Witnesses:

OSCAR F. GUNZ, C. SEDGWICK.

